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Polyimide liquid crystal direct action membrane with fluorine-contained surface and preparation method thereof

A technology of liquid crystal alignment film and polyimide, which is applied in the field of fluorine-containing polyimide liquid crystal alignment film and its preparation, and achieves the effects of wide application, wide range of pretilt angles, and easy polymerization

Inactive Publication Date: 2011-10-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the polyimide liquid crystal aligning film that only has surface fluorine-containing structure has not been reported at present

Method used

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  • Polyimide liquid crystal direct action membrane with fluorine-contained surface and preparation method thereof
  • Polyimide liquid crystal direct action membrane with fluorine-contained surface and preparation method thereof
  • Polyimide liquid crystal direct action membrane with fluorine-contained surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First 2 molar parts of 3,5-diaminobenzoic acid {6-[4'-(phenyl)phenoxy)]hexyl} ester and 8 molar parts of 4-4' diaminodiphenyl ether diamine were added to 30 Add mole parts of m-cresol, and stir until dissolved under nitrogen protection, then add 10 mole parts of 3,3',4,4'-tetracarboxylic diphenyl ether dianhydride at a temperature of 25°C, and stir for 2 hours , and then raised the temperature to 180° C. for imidization reaction for 4 hours to obtain a uniform and transparent polyimide solution.

[0038] The chemical structural formula of this polyimide molecule is:

[0039]

[0040] where n:m=8:2

[0041] Dilute the obtained polyimide solution with m-cresol to a mass percent concentration of 5%, then apply the polyimide solution evenly on the substrate by high-speed spin coating, and under vacuum conditions, prior to the temperature of 100 The solvent was removed at ℃ for 1 hour, and then cured at 225 ℃ for 3 hours to obtain a side chain type polyimide liquid crysta...

Embodiment 2

[0044] Since the conditions of the side-chain type polyimide liquid crystal alignment film prepared in this example are the same as those in Example 1, it is omitted here.

[0045] The fluoridation treatment conditions of this embodiment are: the temperature is 25°C, the treatment time is 5 minutes, the partial pressure of fluorine gas in the reactor is maintained at 45KPa, and the rest are the same as in Example 1, omitted.

Embodiment 3

[0047] Since the conditions of the side-chain type polyimide liquid crystal alignment film prepared in this example are the same as those in Example 1, it is omitted here.

[0048] The fluorination treatment conditions of this embodiment are: temperature 100° C., treatment time 5 minutes, fluorine partial pressure in the reactor kept at 20 KPa, and the rest are the same as in Example 1, omitted.

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Abstract

The invention discloses a polyimide liquid crystal direct action membrane with a fluorine-contained surface, which is characterized in that the surface of the direct action membrane contains a structure of a carbon-fluorine covalent bond, the pretilt angle of which is 4-12.4 degrees or not more than 20 degrees. The invention also discloses a preparation method of the direct action membrane, whichcomprises the following steps: putting a side-chain type polyimide direct action membrane without fluorine structures in a nitrogen-filled vacuum reactor; and than charging mixed gas of fluorine gas and nitrogen in the vacuum reactor to conduct the fluoridation on the surface of the side-chain type polyimide direct action membrane. The polyimide liquid crystal direct action membrane with a fluorine-contained surface not only fills the gap and avoids the general problems of a polyimide liquid crystal direct action membrane with a fluorine-contained body, but also has low cost, wide range of the pretilt angle and wide application scope.

Description

technical field [0001] The invention belongs to the technical field of fluorine-containing polyimide liquid crystal alignment film and its preparation, and in particular relates to a surface fluorine-containing polyimide liquid crystal alignment film and a preparation method thereof. Background technique [0002] Liquid crystal displays (LCDs) have become important display elements in many electronic products. As one of its important components, the liquid crystal alignment film determines the arrangement of liquid crystal molecules inside the display device, and directly affects performance parameters such as device contrast and chromaticity. Polyimide (PI) material has become the most widely used alignment film material in LCD due to its excellent comprehensive properties: excellent mechanical properties, high temperature resistance, low dielectric loss, good orientation adaptability, and easy operation. one. [0003] With the continuous development of LCD technology, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12
Inventor 刘向阳顾宜王旭陈胜亮朱蓉琪盛兆碧
Owner SICHUAN UNIV
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